How does it happen with POP plugin? How would the 110 popserver (a cpanel stuff which gets overwritten if there are upgrades) know of a user connecting to GM POP plugin?
Open relay .... we wouldn't have been around for 5 years if we had that :=)
Too involved as cPanel's Exim installation doesn't have Mysql lookup compiled in
Mail Me If Contacting Privately Is That Necessary.